You can't assume that everyone wants to play on the go, just because their wasn't such games in the past doesn't mean they would get a handhed
How is it going to cripple the switche's marketing message, they should just simply announce that their is a seperate bundle, it doesn't needs adds or marketing. You're forgeting the millions of gamers on the internet who are exposed to gaming news every day through youtube, social media, and forums.
My proposal makes perfect sense, i'm not a statistical firm in order to throw out numbers for you, and my proposal has no drawback at all.
The sale numbers of the pro controller alone show that people do not want to play using the joycons.
If the people who demand such a bundle are exclusively found on the internet (hence no marketing needed), then it's safe to conclude that there's no significant demand for a Switch SKU without Joy-Cons.
Are you sure that you aren't merely pretending that your personal preference is a lot more widespread than it actually is?